Three of the stories featured in the series were, at the time of their publication as scripts, considered lost: The Tomb of the Cybermen, which was recovered a couple of years later and released on video in 1992), and The Power of the Daleks and Galaxy 4, which still do not exist in their entirety. The Power script book was also published several months before the novelisation of the story was finally issued.

The final books in the series, Galaxy 4 and The Crusade, were published in 1994. Further script books were planned for The Abominable Snowmen and the never-novelised The Pirate Planet, and cover art for the former was even circulated, but Titan cancelled the line before these two books were published.